diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b981dfb..f422f9c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,6 +12,8 @@ jobs:
       fail-fast: true
       matrix:
         ruby:
+        - '3.5.0-preview1'
+        - '3.4'
         - '3.3'
         - '3.2'
         - '3.1'
@@ -28,7 +30,7 @@ jobs:
           experimental: true
     runs-on: ${{ matrix.os }}-latest
     steps:
-    - uses: actions/checkout@v4.2.1
+    - uses: actions/checkout@v4.2.2
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{ matrix.ruby }}